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Apparatus and method for reduced peak-to-average-power ratio in a wireless network

a wireless network and peak-to-average-power technology, applied in the field of wireless networks, can solve problems such as distortion and acp nois

Inactive Publication Date: 2007-04-12
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] An improved OFDMA transmitter (e.g., subscriber station) is provided in which spectrum shaping filtering is done on a user-by-user basis. Decisions regarding the spectral shaping filter type and the spectral shaping filter paramet

Problems solved by technology

However, a sudden large signal peak still results in distortion and ACP noise.
This is especially problematic in systems that have large peak-to-average power ratios (PAPRs), such as OFDM and OFDMA systems.

Method used

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  • Apparatus and method for reduced peak-to-average-power ratio in a wireless network

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Embodiment Construction

[0029]FIGS. 1 through 12, discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged wireless network.

[0030] A transmission technique is disclosed for reducing the peak-to-average power (PAPR) ratio—or crest factor—of the transmitted waveforms for multi-carrier signals, such as orthogonal frequency division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) signals. Reducing PAPR provides improved power amplifier efficiency, reduced heat dissipation requirements, smaller heat sinks, reduced power supply load, and lower cost for wireless base stations and subscriber stations. In the descriptions that follow, it shall be assumed generally that transmitters...

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Abstract

A wireless transmission device capable of communicating with a receiver according to a DFT-spread OFDM protocol. The wireless transmission device comprises a configurable spectral shaping filter block capable of performing spectral shaping of an outgoing signal. The wireless transmission device configures the configurable spectral shaping filter block to perform spectral shaping according to a peak-to-average power (PAPR) value associated with the outgoing signal. The multi-carrier protocol comprises one of orthogonal frequency division multiple access (OFDMA) and orthogonal frequency division multiplexing (OFDM).

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) AND CLAIM OF PRIORITY [0001] The present application is related to U.S. Provisional Patent No. 60 / 724,864, filed Oct. 7, 2005, entitled “Low PAPR Wireless Communication System”. U.S. Provisional Patent No. 60 / 724,864 is assigned to the assignee of the present application and is hereby incorporated by reference into the present application as if fully set forth herein. The present application hereby claims priority under 35 U.S.C. §119(e) to U.S. Provisional Patent No. 60 / 724,864. TECHNICAL FIELD OF THE INVENTION [0002] The present application relates generally to wireless networks and, more specifically, to an OFDM network that uses spectral shaping filters. BACKGROUND OF THE INVENTION [0003] Orthogonal frequency division multiplexing (OFDM) is a multi-carrier transmission technique in which a user transmits on many orthogonal frequencies (or subcarriers). The orthogonal subcarriers are individually modulated and separated in frequency such ...

Claims

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Application Information

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IPC IPC(8): H04L5/12
CPCH04L1/0001H04L5/023H04L25/03828H04L27/2614
Inventor KHAN, FAROOQCHO, JOONYOUNGLEE, JUHO
Owner SAMSUNG ELECTRONICS CO LTD
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